Horror at Gull House — Patty Brisco

From her first glimpse of the fog-shrouded mansion Maggie felt that there was something hidden and secretive about Gull House. It all seemed to be centered around Undine, the beautiful young girl washed up, only half alive from the sea, a victim of amnesia. Mysterious things began to happen - Maggie trapped in a sea cave and left to drown, the sudden death of Mrs. Benson, the housekeeper, a terrible fire set in Undine's room after she had been knocked unconscious. Maggie had to find out who the murderer was - before any more innocent people were killed.